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Like other animals, ancestral humans needed to know when to defer or persevere in conflicts and negotiations, given that others can resort to violence. These studies report evidence that humans evolved mechanisms designed to accurately assess men's fighting ability to assist this strategic choice. Visual assessment of men's fighting ability is almost perfectly correlated with perception of upper body strength - the component of strength most relevant to premodern combat.

If you spend any time working at a computer during the day, you know what happens after you've been sitting there for a couple of hours. Your back feels...